Study of radiation field in mesoscopic structure by using photoreactive probes

利用光反应探针研究细观结构中的辐射场

• 批准号: 12440088
• 负责人: KURITA Atusi
• 金额: $ 5.5万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440088/
• 关键词: multiple scattering; interference; photoreaction; localization of light; 多重散乱; 光強度の相関関数

We have investigated the state of multiple-scattered light in random media by using optical memory effect due to interference of multiple-scattered light. We have shown that the hole shape observed in this effect is equivalent to the intensity correlation function. <I(ω)I(ω+Δω)>, which is expressed by using the distribution function of the arrival time of light F(t) as |∫^^∞__0F(t)exp(iΔωt)dt|^2 + <I>^2. Therefore the frequency resolution is inversely proportional to the stay time of light in the medium. Since the stay time is approximately given by L^2/D, where L is the sample thickness, and D is the diffusion constant of light, the frequency resolution is expected to be higher for stronger scatterers. We have confirmed this prediction by using titanium oxide particles as scatterers and controlling the mean free path of light by changing its concentration. However, a deviation from the relation was observed for very strong scatterers, where the behavior of light cannot be described probably due to the weak localization of light. Thus we have established that optical memory effect due to interference of multiple-scattered light is very useful for the investigation of light in random media.

利用多次散射光干涉产生的光学记忆效应，研究了随机介质中多次散射光的状态。我们已经表明，在这种效果中观察到的孔的形状是等价的强度相关函数。&lt;I（ω）I（ω+Δω）&gt;，其通过使用光到达时间F（t）的分布函数表示为|F（t）exp（iΔωt）dt| ^2 +<I>^2。因此，频率分辨率与光在介质中的停留时间成反比。由于停留时间近似由L^2/D给出，其中L是样品厚度，D是光的漫射常数，因此对于较强的散射体，频率分辨率预计会更高。我们已经证实了这一预测，通过使用氧化钛颗粒作为散射体，并通过改变其浓度来控制光的平均自由程。然而，对于非常强的散射体，观察到与该关系的偏离，其中光的行为可能由于光的弱局域化而无法描述。因此，我们已经建立了光学记忆效应由于多次散射光的干涉是非常有用的光在随机介质中的研究。

项目成果

A.Kurita: "Optioal memory effect by interference of multiple-scattered light in a fouprescent fulgide derivative"Mol. Cryst. liq. Cryst.. 344. 205-210 (2000)

A.Kurita：“通过在四色俘精酸酐衍生物中多重散射光的干涉产生光学记忆效应”Mol。

A.Kurita: "Wavelength-and angle-selective properties of optical memory effect by interference of multiple-scattered light in Sm-doped ZnS"J. Luminescence. 87-89. 986-988 (2000)

A.Kurita：“Sm 掺杂 ZnS 中多重散射光干涉的光学记忆效应的波长和角度选择特性”J。

A.Kurita: "Observation of optical memory effect due to interference of multiply-scattered light by using a focused beam"J.Luminescence. (印刷中). (2002)

A.Kurita：“通过使用聚焦光束观察多重散射光的光学记忆效应”（出版中）。

A.Kurita: "Observation of optical memory effect due to interference of multiply-scattered light by using a focused beam"J. Luminescence. (印刷中). (2002)

A.Kurita：“通过使用聚焦光束观察多重散射光的光学记忆效应”（出版中）。

A. Kurita: "Wavelength- and angle-selective properties of optical memory effect by interference of multiple-scattered light in Sm-doped ZnS nanocrystals"J. Lumin.. 87-89. 986-988 (2000)

A. Kurita：“Sm 掺杂 ZnS 纳米晶体中多重散射光干涉的光学记忆效应的波长和角度选择特性”J。